Overvoltage protection device of chopper, chopper and electric locomotive

An overvoltage protection device and overvoltage protection technology, applied in emergency protection circuit devices, electric traction, electric vehicles, etc., can solve the problems of unfavorable auxiliary converter system running smoothly, frequent switching of step-down choppers, and the use of electrical components Life impact and other issues, to achieve the effect of increasing service life, improving operation stability, and improving stability
CN103715656AActive Publication Date: 2014-04-09DATONG ELECTRIC LOCOMOTIVE OF NCR
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DATONG ELECTRIC LOCOMOTIVE OF NCR
Publication Date
2014-04-09

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Abstract

The invention provides an overvoltage protection device of a chopper, the chopper and an electric locomotive. The overvoltage protection device comprises a voltage detection unit, a first voltage comparison unit, a first time acquisition unit, an electric energy absorption unit and a fuse, wherein the voltage detection unit is arranged in an output end circuit of a voltage-decreasing chopper, the first voltage comparison unit is connected with the voltage detecting unit, the first time acquisition unit is connected with the first voltage comparison unit, the electric energy absorption unit is arranged behind an output end voltage detection unit of the voltage-decreasing chopper and is connected with the first time acquisition unit, and the fuse is connected in series with an input end circuit of the chopper. With the overvoltage protection device adopted, the output overvoltage of the chopper can be prevented from damaging components connected in later-stage circuits of the chopper, and therefore, the switching frequency of the chopper can be reduced under the premise that corresponding equipment is protected, and thus, the service life of the chopper can be prolonged, and the operational stability of a system using the chopper can be improved.
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Description

technical field

[0001] The invention relates to electrical control technology, in particular to an overvoltage protection device for a chopper, a chopper and an electric locomotive. Background technique

[0002] With the increasing maturity of power electronic circuits and AC speed regulation technology, AC drive systems are more and more widely used in the field of electric locomotives. The AC drive systems of electric locomotives can be divided into traction drive systems and auxiliary converter systems. The existing auxiliary There are many design structures in the converter system, among which, the intermediate circuit power-taking mode is a widely used mode.

[0003] The auxiliary converter system of this mode is usually equipped with a step-down chopper. First, the high-voltage direct current output by the intermediate circuit of the traction electric transmission system is stepped down through the step-down chopper and then output a voltage with a lower voltage level....

Claims

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